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I find "Preview", standard PDF viewer for the Mac to be pretty good for annotations. I "think" it might be available under acrobat for windows but it's a bit more obscure.

Certainly, between me a mac user, and colleague using Linux I was able to provide feedback on their documentation in this way ...

Interesting. I recall saving as MHTML when I was young but it looks like that's not a thing now.

Internet explorer 5.5, or whatever, supported mhtml flawlessly, but then, Mozilla, or Netscape, it was called, didn't. So unless you're on ie 5.5 for life you're skits out of luck. Mhtml was flawless afaik but nothing else than ie 5.5 or whatever supported it. Mozilla which was Netscape sure did not. mhtml was the best thing. Except whenever using anything but ie 5.5 that is/was.

On the mac I found Skim to be pretty good for annotating PDFs